A cell voltage acquisition structure for a battery module

Abstract

The present invention discloses a structure for collecting the voltage of battery cells in a battery module, which relates to the technical field of electrical accessories. It includes: a connecting piece, the connecting piece is used for electrically connecting with the corresponding cell pole column, the connecting piece has a connecting cavity inside, and a hole communicating with the connecting cavity is opened on the connecting piece, and a sampling wire can extend into the connecting cavity through the hole; a fixing component, the fixing component is used to limit the sampling wire extending into the connecting cavity within the connecting cavity to prevent the sampling wire from separating from the connecting piece. By means of pouring, the sampling wire can be located inside the connecting piece in the present invention, so that the fixing is firm. At the same time, no phenomenon of false soldering will occur. And the wire segment at the connection between the sampling wire and the connecting piece can be provided with a protective rubber sheath, and the protective rubber sheath can fully protect the sampling wire to prevent it from breaking due to fatigue limit. During long-term use, there will be no phenomenon of inaccurate detection caused by loose connection or breakage.

Description

Technical Field

[0001] The present invention relates to the technical field of power accessories, and specifically to a structure for collecting the voltage of battery cells in a battery module. Background Art

[0002] The pole columns of existing battery cells are connected to the aluminum bars on the busbar one by one, and a sampling wire is provided on each aluminum bar. The sampling wire is used to collect the voltage information of the battery cell during operation. During production, most manufacturers use soldering to weld the sampling wire to the aluminum bar sheet. In order to improve the welding strength of soldering, the aluminum bar sheet needs to be nickel-plated.

[0003] At present, nickel-plating of aluminum bars is a non-environmentally friendly behavior, and the nickel-plating price is relatively high, resulting in high production costs. After the sampling wire is welded to the aluminum bar sheet, since the connection between the sampling wire and the aluminum bar sheet is not completely fixed and is prone to form a virtual weld. Therefore, during the driving of the vehicle, the vibration causes the sampling wire and the aluminum bar sheet to generate relative movement for a long time. It is easy to cause the connection between the sampling wire and the aluminum bar sheet to reach the fatigue limit, and then cause the sampling wire to loosen or break. This results in abnormal phenomena such as inaccurate voltage collection. For example, in the patent document with the patent publication number CN215299453U and the name of a structure for improving the versatility and safety of the busbar, a method of welding and connecting the sampling wire and the aluminum bar sheet similar to the above is disclosed. Summary of the Invention

[0004] The purpose of the present invention is to provide a structure for collecting the voltage of battery cells in a battery module to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A structure for collecting the voltage of battery cells in a battery module, which includes: a connecting member, the connecting member is used for electrically connecting with the corresponding battery cell pole column, the connecting member has a connection cavity therein, and a hole communicating with the connection cavity is provided on the connecting member, and the sampling wire can extend into the connection cavity through the hole; a fixing component, the fixing component is used to limit the sampling wire extending into the connection cavity within the connection cavity to prevent the sampling wire from detaching from the connecting member; a pouring channel, the pouring channel can communicate with the connection cavity, and tin liquid can be injected into the connection cavity through the pouring channel.

[0006] Preferably in this technical solution, the connecting member is arranged on the aluminum bar sheet of the busbar body, and the connecting member is electrically connected to the battery cell pole column through the aluminum bar sheet; or, a connection hole is provided on the busbar body, the axis lines of the connection holes are all parallel to the thickness direction of the busbar body, the connecting member is located in the connection hole, and the connecting member is directly electrically connected to the battery cell pole column.

[0007] Preferably, in the technical solution, the connecting member has a cylindrical structure, and the axis line of the connecting member is parallel to the first direction. The thickness direction of the busbar body is the first direction. The first end of the connecting member is used for electrically connecting with the electrode post of the battery cell, and the second end of the connecting member has an opening communicating with the connecting cavity.

[0008] Preferably, in the technical solution, the fixing component includes: a positioning rod extending into the connecting cavity through the opening, the positioning rod extending along the first direction; a wire passing hole formed in the connecting member, the wire passing hole penetrating through the connecting member, and the axis line of the wire passing hole extending along the second direction, the second direction being perpendicular to the first direction; an insertion hole formed in the positioning rod, the axis line of the insertion hole extending along the second direction.

[0009] Preferably, in the technical solution, the fixing component further includes a limiting structure for limiting the relative displacement between the positioning rod and the connecting member in the first direction.

[0010] Preferably, in the technical solution, the limiting structure includes: a plurality of support rods extending radially along the connecting member, the first end of each support rod being connected to the inner wall of the connecting cavity, and the second end of each support rod being provided with an arc portion, each arc portion extending in an arc shape, and the rotation axis of each arc portion coinciding with the axis line of the connecting member. A first internal thread is formed on the inner side wall of the plurality of arc portions, and a first external thread is formed on the outer wall of the positioning rod, and the first internal thread and the first external thread are adapted to each other.

[0011] Preferably, in the technical solution, a stabilizing component is further provided in the connecting cavity, and the stabilizing component is used to apply a pushing force in the first direction to the positioning rod.

[0012] Preferably, in the technical solution, the stabilizing component includes: at least one fixing tube, the axis lines of the plurality of fixing tubes all extending along the first direction, and the first end of the fixing tube being connected to the bottom wall of the connecting cavity; a top rod, a spring and a connecting block corresponding to the plurality of fixing tubes one by one, the top rod being slidably connected with the fixing tube in the first direction, the spring being arranged in the fixing tube for applying a pressure in the first direction to the first end of the top rod, and the connecting block being arranged at the second end of the top rod for applying a pressure in the first direction to the first end of the positioning rod.

[0013] Preferably, the opening on the connecting member forms a pouring channel.

[0014] Preferably, in this technical solution, a seal is provided at the second end of the positioning rod, and the seal is used to seal the opening on the connecting piece; the irrigation channel includes: an irrigation hole opened on the seal, and the irrigation hole extends into the positioning rod along the first direction; a plurality of diversion channels opened on the bottom wall of the irrigation hole, and the plurality of diversion channels are evenly distributed around the axis of the connecting piece, and each diversion channel can communicate the irrigation hole and the connecting cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] For the cell voltage acquisition structure of the battery module, through the irrigation method, the sampling wire can be located inside the connecting piece, making the fixation firm. At the same time, no virtual soldering phenomenon will occur. And the wire segment at the connection between the sampling wire and the connecting piece can have a protective rubber sheath, and the protective rubber sheath can fully protect the sampling wire to prevent it from breaking due to fatigue limit. During long-term use, there will be no phenomenon of inaccurate detection caused by loose connection or breakage. Description of the Drawings

[0017] Figure 1 Is a three-dimensional view of the battery module according to an embodiment of the present invention;

[0018] Figure 2 Is an exploded view of the battery module according to an embodiment of the present invention;

[0019] Figure 3 Is a three-dimensional view of the battery module without the top cover according to an embodiment of the present invention;

[0020] Figure 4 Is a three-dimensional view of the battery module without the top cover and the bus bar body according to an embodiment of the present invention;

[0021] Figure 5 Is a cross-sectional view of the battery module without the top cover according to an embodiment of the present invention;

[0022] Figure 6 Is a three-dimensional view of the cell voltage acquisition structure in an embodiment of the present invention;

[0023] Figure 7 Is a cross-sectional view of the cell voltage acquisition structure in an embodiment of the present invention;

[0024] Figure 8 Is an exploded view of the stable component in an embodiment of the present invention.

[0025] In the figure: 100, box body; 101, battery cell; 102, bus bar body; 103, connection hole; 104, connecting piece; 105, support rod; 106, positioning rod; 107, wire passing hole; 108, insertion hole; 200, first internal thread; 201, first external thread; 203, fixing tube; 204, ejector rod; 205, connecting block; 207, spring; 300, seal; 301, pouring hole; 302, shunt channel; 303, sealing rod; 304, second internal thread; 305, second external thread; 400, connection groove; 401, fixing frame; 402, bundling tube. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that in the description of the present invention, the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0028] In addition, it should be understood that for the convenience of description, the sizes of the various components shown in the accompanying drawings are not drawn according to the actual proportional relationship. For example, the thickness or width of some layers may be exaggerated relative to other layers.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined or described in one drawing, it will not be necessary to further discuss and describe it specifically in the description of the subsequent drawings.

[0030] As Figures 1 to 4 shown, in the battery module of the prior art, it generally includes a box body 100, and a plurality of battery cells 101 are arranged inside the box body 100. The top of the battery cell 101 is provided with a battery cell pole column for welding with the aluminum bar piece on the bus bar body 102. Based on this, the present invention provides a technical solution: a structure for collecting the voltage of battery cells for a battery module, as Figure 5As shown in the figure, it includes: a plurality of connection holes 103 opened on the busbar body 102 and corresponding one-to-one to the cell poles on the battery module. The axis of each connection hole 103 is parallel to the thickness direction of the busbar body 102, and the thickness direction of the busbar body 102 is the first direction. Connectors 104 corresponding one-to-one to the plurality of connection holes 103, the connectors 104 are located in the connection holes 103, and the connectors 104 are electrically connected to the corresponding cell poles. It should be clear here that the connection holes 103 can be holes directly penetrating the busbar body 102 (non-aluminum bar area), or holes opened on the aluminum bar. When the connection holes 103 are opened in the non-aluminum bar area of the busbar body 102, the connectors 104 can be directly electrically connected to the cell poles. When the connection holes 103 are opened on the aluminum bar, the connectors 104 do not need to be directly electrically connected to the cell poles, and they can form an electrical connection with the cell poles through the aluminum bar. Thus, it is easy to think that when the connectors 104 form an electrical connection with the cell poles through the aluminum bar, the connectors 104 can be made into an integral structure. In the present invention, the connector 104 has a connection cavity, and a hole communicating with the connection cavity is opened on the connector 104, and the sampling line can extend into the connection cavity through this hole. At the same time, a pouring channel is also required, and the pouring channel can communicate with the connection cavity, and the user can pour tin liquid into the connection cavity through the pouring channel. Therefore, when wiring and connecting the sampling line, one end of the sampling line with a part of the protective rubber removed can be extended into the connection cavity, and then tin liquid is poured into the connection cavity through the pouring channel. When the tin liquid solidifies in the connection cavity, the end of the sampling line is also sealed in the connector 104. At this time, the connector 104 forms an electrical connection with the sampling line. At the same time, the pouring connection method is adopted, so that the sampling line can be completely fixed. And there is a protective rubber at the part where the sampling line is connected to the connector 104, and the protective rubber can greatly buffer and reduce the relative movement generated between the sampling line and the connector 104. Furthermore, the service life of the sampling line is improved, and the sampling line will not easily reach the fatigue limit.

[0031] It should be clear that, in order to further improve the practicality of the structure of the present invention. The present invention further includes a fixing component, and the fixing component is used to limit the sampling line extending into the connection cavity in the connection cavity to prevent the sampling line from detaching from the connector 104.

[0032] As can be seen from the above, the fixing component can be various components. Such as Figure 5 As shown in the figure, in the present invention, the connector 104 has a cylindrical structure, and the axis of the connector 104 is parallel to the first direction. The first end of the connector 104 is used to be electrically connected to the cell pole, and the second end of the connector 104 has an opening communicating with the connection cavity. At the same time, as Figure 7As shown in the figure, the fixing component includes: a positioning rod 106 extending through an opening into the connection cavity, the positioning rod 106 extending in a first direction; a wire threading hole 107 formed in the connecting member 104, the wire threading hole 107 penetrating through the connecting member 104, and the axis line of the wire threading hole 107 extending in a second direction perpendicular to the first direction; and an insertion hole 108 formed in the positioning rod 106, the axis line of the insertion hole 108 extending in the second direction.

[0033] It should be clear that when the above fixing component is in use, first, the sampling wire is sequentially passed through the wire threading hole 107 and the insertion hole 108, and then the sampling wire is passed out of the connecting member 104 to an appropriate length. Then, the positioning rod 106 is rotated, so that the sampling wire can be wound around the positioning rod 106. Therefore, it can be known that the above appropriate length means that when the sampling wire is wound around the positioning rod 106, it will not easily fall off the positioning rod 106 due to too short a winding length of the sampling wire. At the same time, the winding method can make the sampling wire in close contact with the positioning rod 106 without gaps, which can enhance the subsequent electrical conductivity.

[0034] At the same time, it is easy to think that the fixing component can also be in other forms. For example: in the connection cavity inside the connecting member 104, the positioning rod 106 fixed in the connection cavity. Then the sampling wire is bolted to the positioning rod 106. Or internal threads are formed on the inner wall of the connection cavity, and after the sampling wire is passed into the connection cavity through the wire threading hole 107, a bolt is used to press the wire threading hole 107 in the connection cavity.

[0035] Furthermore, in order to stably limit the sampling wire in the connection cavity, the fixing component further includes a limiting structure for limiting the relative displacement between the positioning rod 106 and the connecting member 104 in the first direction, that is, preventing the positioning rod 106 from sliding out of the opening on the connecting member 104.

[0036] Specifically, as Figure 7 shown, in an embodiment of the present invention, the limiting structure includes: a plurality of support rods 105 extending radially of the connecting member 104, the first end of each support rod 105 being connected to the inner wall of the connection cavity, and an arc portion being provided at the second end of each support rod 105, each arc portion extending in an arc shape, and the rotation axis of each arc portion coinciding with the axis line of the connecting member 104. A first internal thread 200 is formed on the inner side wall of the plurality of arc portions, and a first external thread 201 is formed on the outer wall of the positioning rod 106, and the first internal thread 200 and the first external thread 201 are adapted to each other. Therefore, when in use, screwing the positioning rod 106 with the plurality of arc portions can ensure that there is no relative displacement between the positioning rod 106 and the connecting member 104 in the first direction.

[0037] It should be clear that multiple arc portions can be independent individuals or combined to form a circular ring. At the same time, it is easy to think that in other embodiments, an upper circular tube can be provided on the bottom wall of the connection cavity, and a first internal thread 200 is provided on the inner wall of the circular tube. A first external thread 201 is provided at the first end of the positioning rod 106. In this case, the limiting structure is mainly composed of the circular tube.

[0038] At the same time, in order to make the sampling line located in the connection cavity in a tightened state. When the first internal thread 200 and the first external thread 201 are in contact, the axial center lines of the wire passing hole 107 and the insertion hole 108 are at the same height in the first direction. Preferably, the apertures of the wire passing hole 107 and the insertion hole 108 are also the same. When a screw connection relationship is formed between the first internal thread 200 and the first external thread 201, the height of the axial center line of the insertion hole 108 in the first direction is lower than the height of the axial center line of the wire passing hole 107 in the first direction. In order to prevent the insertion hole 108 and the wire passing hole 107 from damaging the sampling line, the edges of the insertion hole 108 and the wire passing hole 107 in contact with the sampling line are both rounded.

[0039] At the same time, in order to enable the positioning rod 106 to be in close contact with the arc portion without shaking, which may affect subsequent use. A stabilizing assembly is further provided in the connection cavity, and the stabilizing assembly is used to apply a pushing force in the first direction to the positioning rod 106. The generated pushing force can make the contact between the positioning rod 106 and the arc portion close.

[0040] As can be seen from the above, the stabilizing assembly can be any structure. For example: the stabilizing assembly can be an elastic telescopic spring. The telescopic spring is arranged inside the connection cavity, one end of which abuts against the bottom wall of the connection cavity, and the other end of which abuts against the first end of the positioning rod 106. In the present invention, a specific stabilizing assembly is proposed, as Figure 7 and Figure 8 shown, the stabilizing assembly includes: at least one fixed tube 203, the axial center lines of the multiple fixed tubes 203 all extend in the first direction, and the first end of the fixed tube 203 is connected to the bottom wall of the connection cavity. Preferably, the multiple fixed tubes 203 are evenly distributed around the axial center line of the connecting member 104. A push rod 204, a spring 207 and a connecting block 205 corresponding to the multiple fixed tubes 203 one by one, the push rod 204 forms a sliding connection with the fixed tube 203 in the first direction, the spring 207 is arranged inside the fixed tube 203 and is used to apply a pressure in the first direction to the first end of the push rod 204, and the connecting block 205 is arranged at the second end of the push rod 204 and is used to apply a pressure in the first direction to the first end of the positioning rod 106. By applying a force in the first direction to the positioning rod 106 through the multiple connecting blocks 205, the applied force is more stable.

[0041] It should be clear that in the present invention, the pouring channel can also be various. For example, it can be the opening located on the connecting piece 104 mentioned above. Tin liquid can be poured directly into the inside of the connecting cavity through the opening. After the tin liquid solidifies, the sampling line can form a stable connection with the connecting piece 104 that is not easy to separate. Specifically, in another embodiment of the present invention, a seal 300 is provided at the second end of the positioning rod 106, and the seal 300 is used to seal the opening on the connecting piece 104. The seal 300 here can block the opening on the connecting piece 104 after the threaded connection between the positioning rod 106 and the arc portion is completed. Therefore, its shape can be any shape, such as: disc-shaped, thermos stopper-shaped, etc., which will not be described in detail here. On this basis, the pouring channel includes: a pouring hole 301 opened on the seal 300, and the pouring hole 301 extends into the positioning rod 106 along the first direction. A plurality of shunt channels 302 are provided on the bottom wall of the pouring hole 301, and the plurality of shunt channels 302 are evenly distributed around the axis of the connector 104, and each shunt channel 302 can connect the pouring hole 301 and the connection cavity. When it is necessary to pour tin liquid into the connection cavity, the tin liquid is poured into the pouring hole 301. The tin liquid in the pouring hole 301 can evenly flow into the connection cavity from the plurality of shunt channels 302.

[0042] Furthermore, in order to prevent dust from entering from the pouring hole 301 during subsequent use and affecting the use of the structure of the present invention. The present invention also includes a protective component, which includes: a sealing rod 303, the axis of the sealing rod 303 is parallel to the first direction. A second external thread 305 is provided along the outer surface of the sealing rod 303, and a second internal thread 304 is provided along the inner wall of the pouring hole 301. The second internal thread 304 is adapted to the second external thread 305. In order to facilitate the rotation of the sealing rod 303, a groove adapted to a screwdriver is provided at the top of the sealing rod 303. At the same time, it is easy to associate that in order to facilitate the rotation of the positioning rod 106, an anti-skid groove can be provided on the side of the sealing member 300. The positioning rod 106 is driven to rotate by rotating the sealing member 300.

[0043] It should be clear that if Figures 2 to 5 As shown, in order to fix the sampling line, the present invention prevents a large relative displacement at the connection between the sampling line and the connector 104. A fixing frame 401 is also designed in the present invention, and the fixing frame 401 can be sleeved outside the bus body 102. And the fixing frame 401 can be threadedly fixed to the box body 100. A plurality of cluster tubes 402 extend from the inner side of the fixing frame 401. When in use, a plurality of sampling lines are respectively passed through the cluster tubes 402, and a shorter sampling line cannot produce a large relative displacement with the connector 104. In addition, the sampling line can be protected and prevented from breaking.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cell voltage acquisition structure for a battery module, characterized in that, It includes: A connecting member (104) for electrically connecting with a corresponding electrode post of the battery cell. The connecting member (104) has a connecting cavity therein, and a hole communicating with the connecting cavity is formed on the connecting member (104). The sampling wire can extend into the connecting cavity through the hole; A fixing component for restricting the sampling wire extending into the connecting cavity within the connecting cavity to prevent the sampling wire from detaching from the connecting member (104); A pouring channel capable of communicating with the connecting cavity, and molten tin can be injected into the connecting cavity through the pouring channel; The fixing component includes: A positioning rod (106) extending into the connecting cavity through an opening, and the positioning rod (106) extends along a first direction; A wire passing hole (107) formed on the connecting member (104), the wire passing hole (107) penetrates through the connecting member (104), and the axis line of the wire passing hole (107) extends along a second direction, and the second direction is perpendicular to the first direction; an inserting hole (108) formed on the positioning rod (106), and the axis line of the inserting hole (108) extends along the second direction; The fixing component further includes a limiting structure for restricting the relative displacement between the positioning rod (106) and the connecting member (104) in the first direction; The limiting structure includes: a plurality of support rods (105) extending radially along the connecting member (104). The first end of each support rod (105) is connected to the inner wall of the connecting cavity, and an arc portion is provided at the second end of each support rod (105). Each arc portion extends in an arc shape, and the rotation axis of each arc portion coincides with the axis line of the connecting member (104). A first internal thread (200) is formed on the inner side wall of the plurality of arc portions, and a first external thread (201) is formed on the outer wall of the positioning rod (106), and the first internal thread (200) and the first external thread (201) are adapted to each other; A stabilizing component is further arranged in the connecting cavity for applying a pushing force along the first direction to the positioning rod (106); The stabilizing component includes: At least one fixing tube (203), the axis lines of the plurality of fixing tubes (203) all extend along the first direction, and the first end of the fixing tube (203) is connected to the bottom wall of the connecting cavity; A push rod (204), a spring (207) and a connecting block (205) corresponding to the plurality of fixing tubes (203) one by one. The push rod (204) forms a sliding connection with the fixing tube (203) along the first direction. The spring (207) is arranged in the fixing tube (203) for applying a pressure along the first direction to the first end of the push rod (204). The connecting block (205) is arranged at the second end of the push rod (204) for applying a pressure along the first direction to the first end of the positioning rod (106).

2. The battery cell voltage acquisition structure for a battery module according to claim 1, wherein, The connecting member (104) is disposed on the aluminum bar of the busbar body (102), and the connecting member (104) is electrically connected to the cell pole through the aluminum bar; or, a connection hole (103) is provided on the busbar body (102), and the axis of the connection hole (103) is parallel to the thickness direction of the busbar body (102). The connecting member (104) is located in the connection hole (103), and the connecting member (104) is directly electrically connected to the cell pole.

3. The battery cell voltage acquisition structure for a battery module according to claim 2, wherein, The connecting member (104) has a cylindrical structure, and the axis of the connecting member (104) is parallel to the first direction. The thickness direction of the busbar body (102) is the first direction. The first end of the connecting member (104) is used for electrically connecting to the cell pole, and the second end of the connecting member (104) has an opening communicating with the connection cavity.

4. The battery cell voltage acquisition structure for a battery module according to any one of claims 1 or 3, characterized in that, The opening on the connecting member (104) forms a pouring channel.

5. The battery cell voltage acquisition structure for a battery module according to any one of claims 1 or 3, characterized in that, A sealing member (300) is provided at the second end of the positioning rod (106), and the sealing member (300) is used for sealing the opening on the connecting member (104); The pouring channel includes: A pouring hole (301) provided on the sealing member (300), and the pouring hole (301) extends along the first direction into the positioning rod (106); A plurality of diversion channels (302) provided on the bottom wall of the pouring hole (301), and the plurality of diversion channels (302) are evenly distributed around the axis of the connecting member (104), and each diversion channel (302) can communicate the pouring hole (301) and the connection cavity.

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