Battery, battery pack and vehicle

Abstract

The utility model relates to the fields of power batteries, energy storage and the like, particularly provides a battery, a battery pack and a vehicle, and aims to solve the problem of low volume energy density caused by a battery series connection mode in the prior art. In order to achieve the purpose, the battery provided by the utility model comprises a plurality of battery cell units which are sequentially connected in series along a first direction; each battery cell unit comprises a battery cell main body and packaging assemblies, the packaging assemblies are arranged at the two ends of the battery cell main body and used for sealing the battery cell main body, each packaging assembly comprises a pole, the pole is electrically connected with the battery cell main body, and the adjacent battery cell main bodies are connected in series through the pole in the first direction. According to the scheme, the batteries can form the battery pack in a more compact mode, and the volume energy density is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries and energy storage, and specifically provides a battery, a battery pack and a vehicle. Background Art

[0002] For high-voltage CTP (cell to pack) power battery packs, the charging speed is fast, but the manufacturing cost is high.

[0003] For example, an existing 800V battery pack can be realized by connecting blade batteries in series. During the manufacturing process, multiple small modules composed of a certain number of blade batteries are stacked in series to form a large module. These large modules are then placed in a battery box with high voltage series connection to form a battery pack. Multiple small modules are then installed in small spaces separated by the box.

[0004] The utility model aims to solve or at least partially alleviate the problem of low energy density caused by the battery series connection method existing in the prior art. Utility Model Content

[0005] The present invention aims to solve or at least partially alleviate the above-mentioned technical problem, namely, to solve or at least partially alleviate the problem of low energy density caused by the series connection of batteries in the prior art. To this end, the present invention provides a battery comprising:

[0006] A plurality of battery cell units, wherein the plurality of battery cell units are sequentially connected in series along a first direction;

[0007] The battery cell unit includes a battery cell body and a packaging component, the packaging component is arranged at both ends of the battery cell body to seal the battery cell body, the packaging component includes a pole, the pole is electrically connected to the battery cell body, and adjacent battery cell bodies are connected in series along a first direction through the pole.

[0008] In a specific embodiment of the above-mentioned battery, the packaging assembly further includes a cover plate and an insulating member, the cover plate is arranged at the end of the battery cell body, the insulating member is arranged on the surface of the cover plate, the pole is electrically connected to the battery cell body through the cover plate and the insulating member, and the insulating member is suitable for insulating the pole from the cover plate.

[0009] In a specific embodiment of the above-mentioned battery, the poles all include a pole connecting portion and a pole welding portion, the pole welding portion and the pole connecting portion form an integrated structure and are perpendicular to each other, the pole connecting portion is connected to the battery cell body, and the two pole welding portions of adjacent battery cell units are connected.

[0010] In a specific embodiment of the above-mentioned battery, the pole includes a pole connecting portion and a pole welding portion, the pole welding portion and the pole connecting portion form an independent structure and are perpendicular to each other, the pole welding portion is sleeved on the pole connecting portion, the pole connecting portion is connected to the battery cell body, and the two pole welding portions of adjacent battery cell units are connected.

[0011] In a specific embodiment of the battery described above, the contact surfaces of adjacent electrode welding portions are configured as a plug-in structure.

[0012] In a specific embodiment of the above-mentioned battery, the poles of adjacent battery cell units respectively include a first biased pole and a second biased pole, the first biased pole and the second biased pole are welded together, and the geometric center line of the first biased pole and the second biased pole along the first direction is offset relative to the geometric center line of the battery cell body along the first direction.

[0013] In a specific embodiment of the above-mentioned battery, the poles of adjacent battery cell units respectively include a first center pole and a second center pole, the first center pole and the second center pole are welded together, and the geometric center line of the first center pole and the second center pole along the first direction coincides with the geometric center line of the battery cell body along the first direction.

[0014] In a specific embodiment of the battery, the poles for connecting adjacent battery cell bodies in series are provided as an integrated connection structure.

[0015] In a specific embodiment of the battery described above, a geometric center line of the pole along the first direction is offset relative to a geometric center line of the battery cell along the first direction.

[0016] In a specific embodiment of the battery described above, the battery further includes a rubber block, and the adjacent cover plates and the poles are bonded to the rubber block.

[0017] In a specific embodiment of the battery described above, a geometric center line of the pole along the first direction coincides with a geometric center line of the battery cell along the first direction.

[0018] In a specific embodiment of the above-mentioned battery, the packaging assembly further includes an electrode connecting piece, an insulating bracket, and a sealing gasket. The electrode connecting piece is arranged at the end of the battery cell body and is electrically connected to the battery cell body. The pole passes through the sealing gasket, the insulating bracket and the electrode connecting piece in sequence.

[0019] In a specific embodiment of the battery described above, one of the packaging components at both ends of the battery cell body further includes an explosion-proof valve, and the explosion-proof valve is provided on the cover plate.

[0020] In a specific embodiment of the battery described above, a first sampling welding end is provided at one end of the pole, and the first sampling welding end is away from the explosion-proof valve.

[0021] In a specific embodiment of the battery, a second sampling welding end is provided at one end of the cover away from the explosion-proof valve, and the first sampling welding end and the second sampling welding end form a sampling welding area.

[0022] In a specific embodiment of the battery described above, another one of the packaging components at both ends of the battery cell body further includes a sealing nail, and the sealing nail and the explosion-proof valve are respectively provided at both ends of the battery cell body.

[0023] The present utility model also discloses a battery pack, which includes a battery box and a battery according to any one of the above schemes. The battery box is provided with a storage space, and a plurality of the batteries are stacked in sequence along the length direction or the width direction of the battery box in the storage space.

[0024] The utility model also discloses a vehicle, which includes the battery pack described in any one of the above solutions.

[0025] Solution 1. A battery comprising:

[0026] A plurality of battery cell units, wherein the plurality of battery cell units are sequentially connected in series along a first direction;

[0027] The battery cell unit includes a battery cell body and a packaging component, the packaging component is arranged at both ends of the battery cell body to seal the battery cell body, the packaging component includes a pole, the pole is electrically connected to the battery cell body, and adjacent battery cell bodies are connected in series through the poles along the first direction.

[0028] Option 2. According to the battery described in Option 1, the packaging assembly also includes a cover plate and an insulating member, the cover plate is arranged at the end of the battery cell body, the insulating member is arranged on the surface of the cover plate, the pole passes through the cover plate and the insulating member to be electrically connected to the battery cell body, and the insulating member is suitable for insulating the pole from the cover plate.

[0029] Solution 3. According to the battery described in Solution 2, the pole includes a pole connecting portion and a pole welding portion, the pole welding portion and the pole connecting portion form an integrated structure and are perpendicular to each other, the pole connecting portion is connected to the battery body, and the two pole welding portions of adjacent battery cell units are connected.

[0030] Solution 4. According to the battery described in Solution 2, the pole includes a pole connecting part and a pole welding part, the pole welding part and the pole connecting part form an independent structure and are perpendicular to each other, the pole welding part is sleeved on the pole connecting part, the pole connecting part is connected to the battery body, and the two pole welding parts of adjacent battery cell units are connected.

[0031] Solution 5. In the battery according to Solution 3 or 4, the contact surfaces of the adjacent electrode welding portions are configured as a plug-in structure.

[0032] Option 6. According to the battery described in Option 2, the poles of adjacent battery cell units respectively include a first biased pole and a second biased pole, the first biased pole and the second biased pole are welded together, and the geometric center lines of the first biased pole and the second biased pole along the first direction are offset relative to the geometric center line of the battery cell body along the first direction.

[0033] Solution 7. According to the battery described in Solution 2, the poles of adjacent battery cell units respectively include a first center pole and a second center pole, the first center pole and the second center pole are welded together, and the geometric center line of the first center pole and the second center pole along the first direction coincides with the geometric center line of the battery cell body along the first direction.

[0034] Solution 8. The battery according to Solution 2 is configured to provide an integrated connection structure for the poles connected in series to adjacent battery cell bodies.

[0035] Option 9. According to the battery of Option 8, the geometric center line of the pole along the first direction is offset relative to the geometric center line of the battery cell along the first direction.

[0036] Solution 10. The battery according to Solution 6 or 9 further comprises a rubber block, and the adjacent cover plates and poles are bonded to the rubber block.

[0037] Option 11. According to the battery of Option 10, the geometric center line of the pole along the first direction coincides with the geometric center line of the battery cell along the first direction.

[0038] Option 12. According to the battery described in any one of Options 2 to 11, the packaging assembly further includes an electrode connecting piece, an insulating bracket, and a sealing gasket. The electrode connecting piece is provided at the end of the battery cell body and is electrically connected to the battery cell body. The pole passes through the sealing gasket and the insulating bracket in sequence and is connected to the electrode connecting piece.

[0039] Option 13. According to the battery of Option 2, one of the packaging components at both ends of the battery cell body also includes an explosion-proof valve, and the explosion-proof valve is arranged on the cover plate.

[0040] Solution 14. According to the battery of Solution 13, a first sampling welding end is provided at one end of the electrode, and the first sampling welding end is far away from the explosion-proof valve.

[0041] Solution 15. According to the battery of Solution 14, a second sampling welding end is provided at one end of the cover away from the explosion-proof valve, and the first sampling welding end and the second sampling welding end form a sampling welding area.

[0042] Solution 16. According to the battery of Solution 13, another one of the packaging components at both ends of the battery cell body further includes a sealing nail, and the sealing nail and the explosion-proof valve are respectively arranged at both ends of the battery cell body.

[0043] Solution 17. A battery pack, comprising a battery box and the battery of any one of Solutions 1 to 16, wherein the battery box is provided with a storage space, and a plurality of the batteries are stacked in sequence along the length direction or the width direction of the battery box in the storage space.

[0044] Option 18. A vehicle comprising the battery pack described in Option 17.

[0045] The battery disclosed in the present utility model connects a plurality of battery cell bodies in series in sequence along the length direction thereof through poles, so as to change the way in which traditional battery cell units are connected in series in the width direction thereof through connecting plates. Through the above-mentioned structural design, the battery cell bodies are electrically connected through the poles, and a connection strength that meets production needs can be obtained, so that they can be stacked in sequence in the battery box without sacrificing the arrangement space of reinforcing structures such as reinforcing beams in the battery box to improve the strength, thereby more efficiently utilizing the space in the battery box to accommodate more battery cell bodies, thereby improving the volume energy density of the battery pack, reducing the manufacturing cost of the battery box, and simplifying the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0047] Figure 1 This is a schematic diagram of a battery structure according to one embodiment of the present invention, showing a structure in which two battery cells are connected in series, with the longer battery cell being shown as a disconnected line.

[0048] Figure 2 This is a schematic diagram of a battery structure according to one embodiment of the present invention, showing a structure in which three battery cells are connected in series. The longer battery cells are shown as disconnected lines.

[0049] Figure 3This is a schematic diagram of the battery structure of one embodiment of the present invention, showing the structure of two battery cells connected in series and the location of the explosion-proof valve. The enlarged portion of the figure shows that the electrode is electrically connected to the cover plate through a rivet structure. The battery cell is longer and is shown in a disconnected manner.

[0050] Figure 4 This is one embodiment of the battery structure schematic diagram in the present invention, in which an enlarged view is shown of the electrical connection structure between the pole and the cover plate through the rivet structure;

[0051] Figure 5 This is a schematic diagram of the exploded structure of the battery cell unit in the present invention, which shows the structures at both ends of the battery cell unit;

[0052] Figure 6 yes Figure 3 A partial enlarged view of point A in the middle shows the structure of a small-volume independent nail-type offset pole;

[0053] Figure 7 This is a schematic structural diagram of one embodiment of the battery cell unit connection of the present invention, showing the structure of a large-volume split nail-type offset pole;

[0054] Figure 8 This is a schematic structural diagram of one embodiment of the battery cell unit connection of the present invention, showing the structure of a small-volume split-type axial offset pole;

[0055] Figure 9 This is a schematic structural diagram of one embodiment of the battery cell unit connection of the present invention, showing the structure of a large-volume independent axial offset pole;

[0056] Figure 10 This is a structural diagram of one embodiment of the connection of the battery cell unit of the present invention, which shows the structure of a small-volume independent nail-type central pole;

[0057] Figure 11 This is a schematic diagram of the structure of one embodiment of the connection of the battery cell unit of the present invention, which shows the structure of a small-volume independent axial-centered pole;

[0058] Figure 12 This is a schematic structural diagram of one embodiment of the battery cell unit connection of the present invention, which shows the structure of the integrated bias pole;

[0059] Figure 13 This is a structural diagram of one embodiment of the connection of the battery cell unit of the present invention, which shows the structure of the integrated central pole;

[0060] Figure 14It is a schematic diagram of the structure of one embodiment of the battery pack of the present invention, which shows the sampling arrangement of the battery pack for independent sampling, with the batteries stacked along the length of the battery box;

[0061] Figure 15 This is a schematic diagram of the structure of one embodiment of the battery pack of the present invention, which shows another embodiment of the sampling arrangement of the battery pack for independent sampling, with the batteries stacked along the length of the battery box;

[0062] Figure 16 for Figure 15 A partial enlarged view of point B in the middle shows the structure of the independently sampled battery pack ends connected by busbars;

[0063] Figure 17 This is a schematic diagram of the structure of one embodiment of the battery pack of the present invention, which shows the sampling arrangement of the battery pack for independent sampling, with the batteries stacked along the width direction of the battery box;

[0064] Figure 18 It is a schematic structural diagram of one embodiment of the battery pack of the present invention, which shows the battery pack sampling arrangement for overall sampling;

[0065] Figure 19 This is a schematic diagram of the structure of the battery box of the utility model, which shows the structure in which the horizontal and vertical beams are eliminated inside the battery box;

[0066] In the figure: 100, battery cell unit, 101, packaging assembly, 102, battery cell body, 103, cover plate, 104, insulating member, 105, second sampling welding end, 106, electrode connecting piece, 107, insulating bracket, 108, sealing gasket, 109, sealing nail, 110, shoulder;

[0067] 200, pole, 201, first sampling welding end, 202, first offset pole, 203, second offset pole, 204, pole connecting portion, 205, pole welding portion, 206, first center pole, 207, second center pole; 208, rivet;

[0068] 400. Explosion-proof valve, 500. Sampling welding area, 600. Rubber block, 800. Battery box, 900. Bus bar, 901. First information sampling device, 902. Second information sampling device. DETAILED DESCRIPTION

[0069] The following describes preferred embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are intended only to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications.

[0070] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is for ease of description only and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0071] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0072] Before describing the implementation of the battery and battery pack in the present invention, the prior art will be described first to better illustrate the advancement of the technical solution in the present invention.

[0073] At present, in the field of power batteries, taking the 800V high-voltage platform as an example, the traditional manufacturing process is to stack short-blade battery cell units into small modules, and the small modules are grouped into large modules at a time. The large modules use connecting pieces for high-voltage series connection in the stacking direction; BIC (battery information collector) and FPC (flexible circuit board) are arranged vertically and welded to the poles and cover plates on both sides of the large module; multiple large modules are grouped twice and then put into the box, and the small modules need to accurately enter the small cavity isolated by the box.

[0074] The above-mentioned battery packs require high dimensional accuracy control of the cells, small modules, large modules, boxes, and related incoming materials when arranging the cells. They are difficult to box, difficult to manufacture, and costly.

[0075] like Figure 1 As shown, the present invention proposes a battery, which includes a plurality of battery cell units 100, and the plurality of battery cell units 100 are connected in series in sequence along a first direction; the battery cell unit 100 includes a battery cell body 102 and a packaging component 101, and the packaging component 101 is arranged at both ends of the battery cell body 102, and is used to seal the battery cell body 102, and the packaging component 101 includes a pole 200, and the pole 200 is electrically connected to the battery cell body 102, and the adjacent battery cell bodies 102 are connected in series along the first direction through the pole 200.

[0076] In this embodiment, two battery cell units 100 are connected in series as an example. Based on the problems in the prior art, the connection method of the battery cell units 100 is improved. The battery includes two battery cell units 100, which are arranged along a first direction and connected in series with each other, wherein the first direction can be the length direction of the battery cell units 100. In this embodiment, the two battery cell bodies 102 are connected by the poles 200 so that the connected battery cell units 100 have a connection strength that meets the requirements. In the above scheme, multiple battery cell units 100 are connected in series to form a battery, matching the length or width of the battery box 800, eliminating the horizontal and vertical beam structures in the battery box 800, simplifying the battery pack manufacturing process, thereby reducing manufacturing costs, and improving volume energy density.

[0077] See Figure 2 , is a schematic diagram according to an embodiment of the present invention. It should be noted that the number of battery cells 100 included in each battery may depend on the total voltage of the battery pack. Therefore, the battery may not be limited to two battery cells 100 connected in series, but may also include three battery cells 100 connected in series, or even multiple battery cells 100 connected in series.

[0078] The following is based on Figure 3 、 Figure 5-Figure 13 , the battery provided by the utility model is described in detail.

[0079] See Figure 3 , is a schematic diagram of the overall structure of a battery according to an embodiment of the present utility model, Figure 5 This is an exploded view of a battery according to an embodiment of the present invention. The battery cell body 102 is a stacked core set in an aluminum shell. The packaging assembly 101 is set at both ends of the battery cell body 102 to form a seal. The packaging assembly 101 includes a pole 200. The pole 200 connects adjacent battery cell bodies 102 in series along a first direction. The first direction is the length direction of the battery cell unit 100. Figure 5 The first direction is the direction parallel to the X-axis of the coordinate system in the figure, the second direction is the direction parallel to the Y-axis of the coordinate system, and the third direction is the direction parallel to the Z-axis of the coordinate system.

[0080] Based on the above embodiments, see Figure 5 The packaging component 101 also includes a cover plate 103 and an insulating member 104. The cover plates 103 are provided at both ends of the battery cell body 102. The insulating member 104 is provided on the surface of the cover plate 103. The pole 200 abuts against the surface of the insulating member 104. The insulating member 104 insulates and separates the pole 200 and the cover plate 103.

[0081] On the basis of the above embodiments, the pole 200 can adopt different structural forms to realize the series connection of the battery cell units 100. In possible implementations, the poles 200 of adjacent battery cell units 100 can be divided into independent poles and integrated poles according to the connection method. For example, the poles 200 of adjacent battery cell units 100 are connected by welding, which can be considered as independent poles. Of course, it is not limited to welding as a connection method, and other connection methods can also be adopted; the integrated pole is that the poles 200 of adjacent battery cell units 100 are formed in an integrated structure and shared by adjacent battery cell units 100; further, according to the shape of the individual poles of the independent poles, it can be further subdivided into nail-type poles and shaft-type poles; according to the position of the poles between adjacent battery cell bodies 102, it can be divided into offset poles and centered poles; based on the above classification, there are many possible implementations of the pole 200. The following describes the pole 200 in combination with possible implementations. It should be noted that although various embodiments of the pole 200 are described, this is not restrictive, and the pole 200 may also adopt other structures to meet the production requirements of the battery cell bodies 102 in series.

[0082] See Figure 6-Figure 9 In a possible embodiment, the pole 200 adopts an independent structure, and the separated independent pole adopts an offset pole. Specifically, the ends of the two adjacent battery bodies 102 connected in series are respectively provided with a first offset pole 202 and a second offset pole 203. The so-called offset means that the length direction of the battery cell unit 100 is used as the first direction, and the geometric center lines of the first offset pole 202 and the second offset pole 203 are offset relative to the geometric center line of the battery cell unit 100, and the two do not overlap. The geometric center lines of the first offset pole 202 and the second offset pole 203 are offset relative to the geometric center line of the battery cell unit 100 in a direction close to the sampling welding area 500. In this embodiment, the geometric center line can be understood as a line parallel to the length direction of the battery cell (i.e., the first direction) where the center of gravity of the offset pole or the battery cell unit 100 is located.

[0083] An independent bias pole is adopted, and the first bias pole 202 and the second bias pole 203 are connected by laser welding, which provides sufficient structural strength for adjacent battery cells 100. The volume of the bias pole is relatively small, which reduces manufacturing cost and production difficulty.

[0084] See Figure 6 and Figure 8Furthermore, after the first biasing post 202 and the second biasing post 203 are welded, the post 200 occupies the upper space between adjacent battery cell bodies 102. When the volume of the first biasing post 202 and the second biasing post 203 is relatively small, to further improve the strength of the battery, a rubber block 600 is provided adjacent to the independent biasing post 200. The adjacent cover plate 103 and the post 200 are both bonded to the rubber block 600. The independent biasing post 200 is located in the middle area between adjacent battery cell bodies 102, i.e., the upper area of the rubber block 600. When the volume of the first biasing post 202 and the second biasing post 203 is relatively large, the rubber block 600 can be omitted to improve strength. The larger biasing post can meet the strength requirements. It should be noted that the volume of the small-sized post can be understood as the volume required to meet the overcurrent requirement first, and only partially contributes to the strength required for the series connection of multiple battery cell bodies 102. The volume of the general positive column can be understood as the volume that can provide sufficient connection strength in addition to meeting the overcurrent requirement. The connection strength required for the multi-cell series connection can be entirely provided by the volume required by the general positive column connection.

[0085] Based on the above embodiment, in some possible embodiments, the first bias pole 202 and the second bias pole 203 of the independent bias pole can be designed as a nail type and the second bias pole 203 can be designed as an axis type, respectively. Figures 6 to 9 The first bias pole 202 and the second bias pole 203 both include a pole connection portion 204 and a pole welding portion 205. The figure only shows that the second bias pole 203 includes a pole connection portion 204 and a pole welding portion 205. However, it should be noted that the first bias pole 202 also includes a pole connection portion 204 and a pole welding portion 205, but they are not shown in the figure. The nail-type structure is used as an example for explanation. Figure 6 and Figure 7 The nail-type offset pole is an integral connection between the pole connecting portion 204 and the pole welding portion 205, which are perpendicular to each other. The cross-section of the pole welding portion 205 perpendicular to the first direction is larger than the cross-section of the pole connecting portion 204 perpendicular to the first direction, thereby forming a nail-type structure, wherein the pole connecting portion 204 is used to connect to the battery body 102, and the two pole welding portions 205 are welded and fixed after abutting.

[0086] Furthermore, the packaging assembly 101 also includes an electrode connecting piece 106, an insulating bracket 107 and a sealing gasket 108 at the end. The pole connecting portion 204 of the nail-type offset pole passes through the insulating member 104, the cover plate 103, the insulating bracket 107 and the sealing gasket 108 in sequence to achieve electrical connection with the electrode connecting piece 106.

[0087] See Figure 8 and Figure 9Furthermore, taking the axial structure as an example, the pole connection portion 204 is an axial structure, and the pole welding portion 205 is sleeved on the end of the pole connection portion 204. The pole welding portion 205 and the pole connection portion 204 are connected by welding. The two are independent structures and perpendicular to each other. The axial structure facilitates the assembly of the package component 101 and improves production efficiency. A boss 110 is provided at one end of the axial bias pole near the electrode connecting piece 106. Between the boss 110 and the pole welding portion 205 are a sealing gasket 108, an insulating bracket 107, a cover plate 103, and an insulating member 104. The boss 110 and the pole welding portion 205 press the above-mentioned components together, thereby improving the sealing of the battery cell 100 and the stability of the independent bias pole, thereby improving the strength of the welding between the first bias pole 202 and the second bias pole 203.

[0088] In addition, a groove structure is designed at the weld between the pole connecting part 204 and the pole welding part 205 of the axial structure to provide a welding space for the welding of the pole connecting part 204 and the pole welding part 205. At the same time, it can also ensure that the two pole welding parts 205 can ensure the flat abutment of the end faces when butt welding, thereby improving the dimensional accuracy of the battery cell after welding. Considering the accuracy of the battery cell assembled into the battery box 800 after welding, the above structure can effectively avoid scratches between the battery and the battery box 800, thereby improving safety.

[0089] See Figure 6 Furthermore, whether it is a nail-type pole or an axis-type pole, the end face of the pole welding part 205 can be set as a plug-in structure. On the one hand, the plug-in structure can facilitate the accurate docking between the poles during independent pole welding, thereby improving production efficiency; on the other hand, the plug-in structure enables more precise dimensional control during independent pole welding, which is beneficial for avoiding scratches and improving safety when the battery stack is subsequently placed in the battery box 800.

[0090] See Figure 10 and Figure 11 In another possible embodiment, the pole 200 adopts an independent structure, and the independent pole adopts a centered pole. Specifically, the ends of the two adjacent battery bodies 102 connected in series are respectively provided with a first centered pole 206 and a second centered pole 207. The so-called centering means that the length direction of the battery unit 100 is used as the first direction, and the geometric center lines of the first centered pole 206 and the second centered pole 207 coincide with the geometric center line of the battery unit 100. In this embodiment, the geometric center line can be understood as the line parallel to the length direction of the battery cell where the center of gravity of the centered pole or the battery unit 100 is located.

[0091] An independent center pole is adopted, and the first center pole 206 and the second center pole 207 are connected by laser welding to provide sufficient structural strength for the adjacent battery cell body 102. The volume of the center pole is relatively large, and the rubber block 600 can be eliminated, so that the adjacent battery cell units 100 have sufficient welding strength.

[0092] On the basis of the above embodiments, in some possible embodiments of the first center pole 206 and the second center pole 207 of the independent center pole, the first center pole 206 and the second center pole 207 can be designed as a nail type and an axis type, respectively. It should be noted that, as far as the independent center pole and the independent offset pole are concerned, the structures of the nail type offset pole and the nail type center pole, and the axis type offset pole and the axis type center pole are basically the same, which will not be repeated here. Please refer to the description of the nail type offset pole and the axis type offset pole in the above embodiments.

[0093] See Figure 12 and Figure 13 In some other possible embodiments, the pole 200 adopts an integrated structure, that is, the connection between adjacent battery cell bodies 102 shares an integrated pole. Compared with independent poles, the integrated pole has better connection strength and simpler manufacturing process.

[0094] Furthermore, as an integrated pole, it can also be divided into an integrated offset pole and an integrated centered pole according to the different positions it occupies between adjacent battery cell bodies 102. When the volume of the integrated offset pole is small, it needs to be combined with the rubber block 600 to further improve the connection strength of the adjacent battery cell bodies 102. When the volume is large, the rubber block 600 can be used to meet the strength requirements. The integrated centered pole has a larger volume and can meet the connection strength requirements.

[0095] See Figure 6 In some embodiments of the present invention, one of the packaging components 101 at both ends of the battery body 102 further includes an explosion-proof valve 400, which can release pressure when the battery unit 100 fails. Figure 6 The position of the explosion-proof valve 400 is described. In other embodiments, the explosion-proof valve 400 can be set at a suitable position according to actual needs.

[0096] On the basis of the above embodiments, further reference is made to Figure 5One end of the pole 200 is configured as a first sampling welding end 201, which is located away from the explosion-proof valve 400. The end of the cover 103 away from the explosion-proof valve 400 is designed as a second sampling welding end 105. Both sides of the pole 200 are battery cells 100. The first sampling welding end 201 and the second sampling welding end 105 form a sampling welding area 500. When individual battery cell information sampling is required, information is collected through the sampling welding area 500 formed by the first sampling welding end 201 and the second sampling welding end 105, thereby independently collecting information from the battery cell 100. The collected information is not limited to parameters such as current, voltage, and temperature. For example, the pole 200 between adjacent battery cell bodies 102 occupies a portion of the space as a strong electrical connection, and the sampling welding area 500 serves as a welding end for information sampling, providing a weak electrical connection. It should be noted that the above examples are possible implementations and do not limit the scope of protection. Other feasible arrangements are also within the scope of protection of this utility model.

[0097] Furthermore, a sealing nail 109 is provided on the packaging component 101 at one end of the battery cell body 102 opposite to the explosion-proof valve 400 . The sealing nail 109 is used to seal the liquid injection hole of the cover plate 103 .

[0098] The present invention also proposes a battery pack, which is designed to match the batteries in the above embodiment according to the width or length dimensions of the battery box 800, and then the batteries are stacked in sequence in the accommodation space within the battery box 800.

[0099] In some possible embodiments, see Figure 14 , taking two battery cells 100 connected in series to form a battery as an example, the battery pack is a structure in which the batteries are stacked along the length direction of the battery box 800; Figure 17 In another possible embodiment, taking three battery cells 100 connected in series to form a battery as an example, the battery pack is a structure in which the batteries are stacked along the width direction of the battery box 800.

[0100] The battery packs in the above embodiments are compared to traditional battery packs, which have complex design and manufacturing processes and high costs. For example, in the traditional high-voltage CTP architecture, the layout of the cells requires high dimensional precision control of the cells, small modules, large modules, the box, and related incoming materials, making them difficult to box, difficult to manufacture, and expensive.

[0101] The battery pack of this embodiment changes the structure of the battery cells in series and the arrangement of the battery box 800, so that the battery cells in series have better connection strength, thereby eliminating the horizontal and vertical beam structures in the battery box 800. Figure 19, stacked and arranged in the battery box 800, more efficiently utilizing the space in the battery box 800, improving the weight energy battery density, and at the same time reducing the manufacturing cost of the battery box 800; finally, simplifying the structure of the battery box 800, reducing welding and deformation; simplifying the battery pack manufacturing process and procedures, reducing parts and components, and reducing manufacturing costs; at the same time, improving space utilization and increasing volume energy density.

[0102] On the basis of the above embodiment, the battery pack also includes a sampling device, which can be used to collect relevant information parameters at the level of the battery cell 100 or battery or battery pack. The information parameters include but are not limited to current, voltage, temperature and other information parameters. Exemplarily, in the collection method that can be realized, the sampling device is used to connect to both ends of the battery for information collection and transmission. At the same time, the sampling device is also connected to the sampling welding area 500 between adjacent battery cells 100 for information collection and transmission. By adopting the above scheme, each battery in the battery pack can be independently sampled for information, and independent monitoring and management can be achieved. It should be noted that, refer to Figure 5 As in the above battery embodiment, adjacent battery cell units should be understood as two adjacent battery cell units 100 along the first direction (ie, the direction parallel to the X-axis in the coordinate system) when the battery is used as a unit.

[0103] See Figure 15 and Figure 16 In a possible embodiment of the sampling device, the sampling device samples through the sampling welding area 500 formed by the first sampling welding end 201 of the pole 200 of each battery series part and the second sampling welding end 105 of the cover plate 103. For example, the first information sampling device 901 can be arranged on the upper surface of the battery series part and connected to the sampling welding area 500 to collect corresponding information. Busbars 900 are set at both ends of the battery pack. On the one hand, the busbars 900 serve as a strong electrical connection medium for connecting the stacked batteries; on the other hand, at the positive pole of the battery, the busbar 900 is provided with bent pins for connecting the pole 200 and the cover plate 103, thereby transmitting the sampling information of the battery end to the first information sampling device 901 of the battery series part. Of course, as long as the structure can make the pole 200 and the cover plate 103 conductive, it can realize the collection and transmission of information from the end of the battery pack, refer to Figure 3 and Figure 4 A rivet 208 structure may be provided on the pole 200. As shown in the figure, a portion of the pole 200 is raised to form a rivet 208. The rivet 208 passes through the insulating member 104 and forms a connection with the cover plate 103, thereby conducting to realize the collection and transmission of information at the end of the battery pack; the above structure is only an example. It can be understood that after the batteries are stacked to form a battery pack, when sampling independently, as long as the structure can make the pole and the cover plate of the positive electrode part at both ends of the battery pack conductive, the information at the end of the battery pack can be collected and transmitted, and there is no need to set additional information sampling devices at both ends of the battery pack.

[0104] See Figure 14 and Figure 17 The battery pack is designed by matching the batteries of the above embodiment to the width or length of the battery box 800. The batteries are then stacked in sequence in the storage space of the battery box 800. After the multiple batteries are stacked, there are multiple sampling welding areas 500 between adjacent battery cells 102 and they are arranged in a straight line. In other possible embodiments, the sampling device includes a first information sampling device 901 and a second information sampling device 902. The first information collection end of the first information sampling device 901 is connected to the sampling welding areas 500 between adjacent battery cells 102 to collect and transmit information. The first information collection end can be configured as a lead or other connection method as long as information transmission can be achieved. The second information collection ends of the two second information sampling devices 902 are connected to the two ends of the battery. The second information collection ends can also be configured as leads or other connection methods as long as information transmission can be achieved. Through the above solution, independent sampling of the battery cells 100 can be achieved, thereby performing data analysis on each battery cell 100 in the battery pack, understanding the operating status of each battery cell 100, and improving the safety of the battery pack. It should be noted that the first information sampling device 901 can be an FPC (flexible printed circuit), and the second information sampling device 902 can be a BIC (battery information collector), or the first information sampling device 901 can be a BIC (battery information collector), and the second information sampling device 902 can be an FPC (flexible printed circuit). As long as the battery can be segmented and independent information sampling can be achieved, the first information sampling device 901 and the second information sampling device 902 are both connected to the information processing device to process the collected information.

[0105] Furthermore, in other possible sampling connection modes, the sampling device is only used to connect to the two ends of the battery to collect and transmit information. The sampling device can sample information from the entire battery pack for monitoring and management.

[0106] See Figure 18Based on the above embodiment, this battery pack is designed by matching the batteries of the above embodiment to the width or length dimensions of the battery case 800. The batteries are then stacked sequentially in the storage space within the battery case 800. The sampling device includes a first information sampling device 901 and a second information sampling device 902. The first information acquisition terminal of the first information sampling device 901 is connected to one end of the battery, and the second information acquisition terminal of the second information sampling device 902 is connected to the other end of the battery. This method samples the entire battery pack and analyzes the operating status of the entire battery pack. It should be noted that the first and second information acquisition terminals can be configured as leads or other connection methods as long as they can achieve information transmission. The first information sampling device 901 can be an FPC (flexible printed circuit) and the second information sampling device 902 can be a BIC (battery information collector), or the first information sampling device 901 can be a BIC (battery information collector) and the second information sampling device 902 can be an FPC (flexible printed circuit). Both the first and second information sampling devices 901 and 902 are connected to an information processing device to process the collected information.

[0107] The present invention also provides a vehicle, which includes the battery pack of any one of the above embodiments. It should be noted that the vehicle can be but is not limited to an electric vehicle, a hybrid vehicle, a commercial vehicle, etc.

[0108] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A battery, characterized in that: The battery comprises: A plurality of battery core units (100), wherein the plurality of battery core units (100) are sequentially connected in series along a first direction; The battery cell unit (100) comprises a battery cell body (102) and a packaging assembly (101), wherein the packaging assembly (101) is arranged at both ends of the battery cell body (102) and is used to seal the battery cell body (102), and the packaging assembly (101) comprises a pole (200), wherein the pole (200) is electrically connected to the battery cell body (102), and adjacent battery cell bodies (102) are connected in series along the first direction through the pole (200).

2. The battery according to claim 1, characterized in that The packaging assembly (101) further includes a cover plate (103) and an insulating member (104); the cover plate (103) is arranged at the end of the battery cell body (102); the insulating member (104) is arranged on the surface of the cover plate (103); the pole (200) passes through the cover plate (103) and the insulating member (104) to be electrically connected to the battery cell body (102); and the insulating member (104) is suitable for insulating the pole (200) from the cover plate (103).

3. The battery according to claim 2, characterized in that The pole (200) comprises a pole connecting portion (204) and a pole welding portion (205); the pole welding portion (205) and the pole connecting portion (204) form an integrated structure and are perpendicular to each other; the pole connecting portion (204) is connected to the battery cell body (102); and two pole welding portions (205) of adjacent battery cell units (100) are connected.

4. The battery according to claim 2, characterized in that The pole (200) comprises a pole connecting portion (204) and a pole welding portion (205); the pole welding portion (205) and the pole connecting portion (204) form an independent structure and are perpendicular to each other; the pole welding portion (205) is sleeved on the pole connecting portion (204); the pole connecting portion (204) is connected to the battery cell body (102); and two pole welding portions (205) of adjacent battery cell units (100) are connected.

5. The battery according to claim 3 or 4, characterized in that The contact surfaces of the adjacent pole welding portions (205) are arranged as a plug-in structure.

6. The battery according to claim 2, characterized in that The poles (200) of the adjacent battery cell units (100) respectively include a first bias pole (202) and a second bias pole (203), the first bias pole (202) and the second bias pole (203) are welded together, and the geometric center lines of the first bias pole (202) and the second bias pole (203) along the first direction are offset relative to the geometric center line of the battery cell body (102) along the first direction.

7. The battery according to claim 2, characterized in that The poles (200) of the adjacent battery cell units (100) respectively include a first center pole (206) and a second center pole (207), the first center pole (206) and the second center pole (207) are welded together, and the geometric center line of the first center pole (206) and the second center pole (207) along the first direction coincides with the geometric center line of the battery cell body (102) along the first direction.

8. The battery according to claim 2, characterized in that The poles (200) used to connect adjacent battery cell bodies (102) in series are provided as an integrated connection structure.

9. The battery according to claim 8, characterized in that The geometric center line of the pole (200) along the first direction is offset relative to the geometric center line of the battery cell unit (100) along the first direction.

10. The battery according to claim 6 or 9, characterized in that The battery further comprises a glue block (600), and the adjacent cover plates (103) and the poles (200) are both bonded to the glue block (600).

11. The battery according to claim 10, characterized in that The geometric center line of the pole (200) along the first direction coincides with the geometric center line of the battery cell unit (100) along the first direction.

12. The battery according to claim 2, characterized in that The packaging assembly (101) further comprises an electrode connecting piece (106), an insulating bracket (107), and a sealing gasket (108); the electrode connecting piece (106) is provided at the end of the battery cell body (102) and is electrically connected to the battery cell body (102); the pole (200) passes through the sealing gasket (108) and the insulating bracket (107) in sequence and is connected to the electrode connecting piece (106).

13. The battery according to claim 2, characterized in that One of the packaging components (101) at both ends of the battery cell body (102) further includes an explosion-proof valve (400), and the explosion-proof valve (400) is arranged on the cover plate (103).

14. The battery according to claim 13, characterized in that One end of the pole (200) is provided with a first sampling welding end (201), and the first sampling welding end (201) is far away from the explosion-proof valve (400).

15. The battery according to claim 14, characterized in that A second sampling welding end (105) is provided at one end of the cover plate (103) away from the explosion-proof valve (400), and the first sampling welding end (201) and the second sampling welding end (105) form a sampling welding area (500).

16. The battery according to claim 13, characterized in that Another one of the packaging components (101) at both ends of the battery cell body (102) further includes a sealing nail (109), and the sealing nail (109) and the explosion-proof valve (400) are respectively arranged at both ends of the battery cell body (102).

17. A battery pack, characterized in that: The battery pack comprises a battery box (800) and a battery according to any one of claims 1 to 16, wherein the battery box (800) is provided with a storage space, and a plurality of the batteries are stacked in sequence along the length direction or the width direction of the battery box (800) and arranged in the storage space.

18. A vehicle, characterized in that: The vehicle includes the battery pack according to claim 17.

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